Buffing wheel



' April 19327? G. E HEYER 1,852,885

BUFFING WHEEL Filed April 25, 1928 7 lElEl- 6 Sum/1m GEO/7.05 E HEVEA an WJ@ m ?ate'nted Apr. E932 a TES- PATENT OFFICE GEORGE E. HEYE'B, OF LITTLE 306K, A'BKANSAB Bums warm.

Application med April 28,

My invention relates to abradin instruments and in particular to abrading tools of the wheel or rotary type. Heretofore in this art, it has been customary to form such tools of composition material in some instances, and in other instances of superimposed layers of abrasive cloth, wound or otherwise disposed circumferentially over a core. It is with this latter type that the present invention is concerned.

In the abrading wheels of the prior art, which are formed of circumferentially superimposed layers of abrading cloth, it has been customary practice to glue the strips together in order to provide a compact unitary wheel presenting an abrasive periphery. In such cases the amount of glue employed has a detrimental effect upon the efiicienQy of the abrading material and as the abrading surface wears down, it is a matter of some dificulty to remove the worn surface in order to present a fresh abrading surface. Attempts have been made to overcome this objection by providing at intervals in the strip of material from which the wheel is formed, scores or perforations extending transversely across the strip whereby as the abrading surface wears down, the strip may be torn ofi from the body of the wheel. This is objectionable in that it leaves frayed edges and-it is not possible to secure an even abrading surface at the periphery of the wheel. Furthermore, a manual operation is required in tearing of! the worn strips and this necessitates a loss of time in operating the instrument.

It is an object of the present invention to provide an abrasive instrument such as a buifing wheel, so formed that the removal of the worn abrading periphery is entirely automatic in the operation of the tool. .Another object of the invention is the provision of a novel method of forming a-bufling wheel for accomplishing the automatic throwing oil of a worn abrading periphery. Other objects of the invention are; to provide an improved bufiing wheel of the superimposed abrading cloth-type having means for automatically presenting a fresh abrading periphery upon the wearing down of the operamas. Serial No. 2729197. 9'

lustrated in the accompanying drawings, wherein Figure 1 is a perspective of a bufing wheel v constructed in accordance with the principles of the invention.

Figure 2 is an enlarged edge view of a portion of the wheel.

Figure 3 is a fragmentary perspective of the under-side of a portion of the abrading cloth strip of which the wheel is formed.

In order to effect a compliance with the statute, I have illustrated and described one practical, physical embodiment of the invention, as applied to the formation of a bufiing wheel. 'However, I desire it to be understood that the principles of the invention are equally applicable to any form of abrading or polishing instrument of the wheel type wherein an operatively engageable periphery requires a periodic removal in the operation of the tool.

In detail my improved wheel comprises a cylindrical core 4 adapted to be secured in an conventional manner over the operating spindle of a driving motor, not shown. For this purpose the core is provided with a central bore 5. The body of the wheel is built up from a single length or stri of emery. cloth which is wound upon itsel circumferentially over the core 4 to thevdesired thickness of body.

As shown in Figure 1, the strip is wound counter-clockwise on the core.

This emery cloth is of well-known constructionQcomprising a backing fabric6 havan outer facing of abrasive material 7 suitably secured to thebacking strip. In assembling or making up the wheel, the ends of the strip 6 are cut diagonall on the bias, as shown by the diagonal e ge 8 at the outer end of the strip, in Figure 1. The inner end of the strip is glued or otherwise suitably attached to the periphery of the core 4 and the strip is then wound by any suitable means or mechanism circumferentially upon the core and at spaced intervals the under or smooth side of the backing strip 6 has disposed thereon narrow bands 9 of applied glue, which bands are arranged diagonally across the strip in parallelism with each other and with the biased edge 8. These bands of glue are applied while the glue is hot and they are of relatively narrow width as clearly shown in Figure 3.

As the strip is wound upon the core, the superimposed peripheral windings will present the backing cloth into engagement with the abrading material 7 so that the glued portions 9 will engage and bind the successive layers at a plurality of circumferentially spaced points throughout the body of the wheel. At the conclusion of the winding operation the outer end 8 is glued down and the wheel is then ready for use.

In operation the wheel is rotated clockwise in an opposite direction to which the strip is wound. The continued application of the work to the exposed peripheral edge of the wheelwill eventually wear through this portion of the strip. The wear will e substantially equal at all points on the circumference, but the work engaged portion of the strip will give first at the point of greatest strain. This is the glued diagonal end 8, of the strip. As the wheel is rotating oppositely from the direction of the winding of the strip when the same is released at the end 8, the entire work engaged ortion will fly outwardly by centrifugal orce. The weakened other spaced glued contacts of the work engaged portion cannot resist this centrifugal force and the first stop of the releasing action will be the first heretofore protected glued contact between the formerly protected layer and its next adjacent superposed layer. This will be obviously somewhat past the worn work engaged portion of the strip so that the same is automatically entirely removed.

As the glued contacts are all biased similar to the diagonal original edge 8, of the strip, the one that stops the releasing action of the worn work engaged portion of the strip will cause it to tear off in front thereof, which will produce a new diagonal end for the strip, similar to the end 8. The result will be that an entirely new surface automatically then of the wheel presents itself on the periphery t e strip. This including the diagonal end of operation will be automatically repeated as as it automatically releases itself when suficiently worn through.

Any suitable adhesive may be utilized, but

I prefer to employ an ordinary commercial glue which is applied while hot in'thin norrow bands at spaced intervals about the periphery of each succeeding layer.

The biased original free end of the strip and the biased glued contacts facilitate tearing and releasin of the strip undercentrifugal action cause by rotation of the wheel oppositely to the direction of the strip winding.

I claim:

1. A bufiing wheel comprising a'oore, an abrading cloth strip wound circumferentially over the core and upon itself, the successive layers of said strip being secured to each other by narrow bands of adhesive a plied at spaced points to the backing of the strip.

2. A bufiing wheel comprising a core, a strip of emery cloth attached at one end to said core and wound circumferentially upon itself in a. plurality of superimposed layers, and means uniting the superimposed layers at a plurality of points spaced circumferentially about the wheel.

3. An abrading instrument comprising a wheel having a core, a continuous strip of abrading cloth wound circumferentially upon itselfover said core and having end edges cut on the bias, and a plurality of spaced bands of applied adhesive on the under-face of said strip and arranged on the bias in parallel with said end edges.

4. A bufiing wheel comprising a core, a strip of abrading cloth wound circumferentially in superimposed layers over said core, and means uniting said superimposed layers in such manner as to cause the automatic tearing off of an outer layer when the same is worn through in the operation of the wheel.

'5. The method of automatically renewing the abrasive surface of an abrading wheel having successive layers of abrasive material by removing successive peripheral layers of abrasive material under the action of centrifugal force.

In testimony whereof I afiiX my signature.

GEORGE E. HEYER. 

